Adding support for a single stack, GCC check in will follow
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9697 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
@@ -1,6 +1,6 @@
|
||||
//------------------------------------------------------------------------------
|
||||
//
|
||||
// Copyright (c) 2008-2009 Apple Inc. All rights reserved.
|
||||
// Copyright (c) 2008-2010 Apple Inc. All rights reserved.
|
||||
//
|
||||
// All rights reserved. This program and the accompanying materials
|
||||
// are licensed and made available under the terms and conditions of the BSD License
|
||||
@@ -16,8 +16,10 @@
|
||||
|
||||
/*
|
||||
|
||||
This is the stack constructed by the exception handler
|
||||
|
||||
This is the stack constructed by the exception handler (low address to high address)
|
||||
# R0 - IFAR is EFI_SYSTEM_CONTEXT for ARM
|
||||
Reg Offset
|
||||
=== ======
|
||||
R0 0x00 # stmfd SP!,{R0-R12}
|
||||
R1 0x04
|
||||
R2 0x08
|
||||
@@ -43,7 +45,7 @@ This is the stack constructed by the exception handler
|
||||
LR 0x54 # SVC Link register (we need to restore it)
|
||||
|
||||
LR 0x58 # pushed by srsfd
|
||||
CPSR 0x5c # pushed by srsfd
|
||||
CPSR 0x5c
|
||||
|
||||
*/
|
||||
|
||||
@@ -57,6 +59,10 @@ This is the stack constructed by the exception handler
|
||||
PRESERVE8
|
||||
AREA DxeExceptionHandlers, CODE, READONLY
|
||||
|
||||
//
|
||||
// This code gets copied to the ARM vector table
|
||||
// ExceptionHandlersStart - ExceptionHandlersEnd gets copied
|
||||
//
|
||||
ExceptionHandlersStart
|
||||
|
||||
Reset
|
||||
@@ -85,101 +91,109 @@ Fiq
|
||||
|
||||
ResetEntry
|
||||
srsfd #0x13! ; Store return state on SVC stack
|
||||
cpsid if,#0x13 ; Switch to SVC for common stack
|
||||
; We are already in SVC mode
|
||||
stmfd SP!,{LR} ; Store the link register for the current mode
|
||||
sub SP,SP,#0x20 ; Save space for SP, LR, PC, IFAR - CPSR
|
||||
stmfd SP!,{R0-R12} ; Store the register state
|
||||
|
||||
mov R0,#0
|
||||
mov R0,#0 ; ExceptionType
|
||||
ldr R1,CommonExceptionEntry
|
||||
bx R1
|
||||
|
||||
UndefinedInstructionEntry
|
||||
srsfd #0x13! ; Store return state on SVC stack
|
||||
cpsid i,#0x13 ; Switch to SVC for common stack
|
||||
cps #0x13 ; Switch to SVC for common stack
|
||||
stmfd SP!,{LR} ; Store the link register for the current mode
|
||||
sub SP,SP,#0x20 ; Save space for SP, LR, PC, IFAR - CPSR
|
||||
stmfd SP!,{R0-R12} ; Store the register state
|
||||
|
||||
mov R0,#1
|
||||
ldr R1,CommonExceptionEntry
|
||||
mov R0,#1 ; ExceptionType
|
||||
ldr R1,CommonExceptionEntry;
|
||||
bx R1
|
||||
|
||||
SoftwareInterruptEntry
|
||||
srsfd #0x13! ; Store return state on SVC stack
|
||||
cpsid i,#0x13 ; Switch to SVC for common stack
|
||||
; We are already in SVC mode
|
||||
stmfd SP!,{LR} ; Store the link register for the current mode
|
||||
sub SP,SP,#0x20 ; Save space for SP, LR, PC, IFAR - CPSR
|
||||
stmfd SP!,{R0-R12} ; Store the register state
|
||||
|
||||
mov R0,#2
|
||||
mov R0,#2 ; ExceptionType
|
||||
ldr R1,CommonExceptionEntry
|
||||
bx R1
|
||||
|
||||
PrefetchAbortEntry
|
||||
sub LR,LR,#4
|
||||
srsfd #0x13! ; Store return state on SVC stack
|
||||
cpsid i,#0x13 ; Switch to SVC for common stack
|
||||
cps #0x13 ; Switch to SVC for common stack
|
||||
stmfd SP!,{LR} ; Store the link register for the current mode
|
||||
sub SP,SP,#0x20 ; Save space for SP, LR, PC, IFAR - CPSR
|
||||
stmfd SP!,{R0-R12} ; Store the register state
|
||||
|
||||
mov R0,#3
|
||||
mov R0,#3 ; ExceptionType
|
||||
ldr R1,CommonExceptionEntry
|
||||
bx R1
|
||||
|
||||
DataAbortEntry
|
||||
sub LR,LR,#8
|
||||
srsfd #0x13! ; Store return state on SVC stack
|
||||
cpsid i,#0x13 ; Switch to SVC for common stack
|
||||
cps #0x13 ; Switch to SVC for common stack
|
||||
stmfd SP!,{LR} ; Store the link register for the current mode
|
||||
sub SP,SP,#0x20 ; Save space for SP, LR, PC, IFAR - CPSR
|
||||
stmfd SP!,{R0-R12} ; Store the register state
|
||||
|
||||
mov R0,#4
|
||||
mov R0,#4 ; ExceptionType
|
||||
ldr R1,CommonExceptionEntry
|
||||
bx R1
|
||||
|
||||
ReservedExceptionEntry
|
||||
srsfd #0x13! ; Store return state on SVC stack
|
||||
cpsid if,#0x13 ; Switch to SVC for common stack
|
||||
cps #0x13 ; Switch to SVC for common stack
|
||||
stmfd SP!,{LR} ; Store the link register for the current mode
|
||||
sub SP,SP,#0x20 ; Save space for SP, LR, PC, IFAR - CPSR
|
||||
stmfd SP!,{R0-R12} ; Store the register state
|
||||
|
||||
mov R0,#5
|
||||
mov R0,#5 ; ExceptionType
|
||||
ldr R1,CommonExceptionEntry
|
||||
bx R1
|
||||
|
||||
IrqEntry
|
||||
sub LR,LR,#4
|
||||
srsfd #0x13! ; Store return state on SVC stack
|
||||
cpsid i,#0x13 ; Switch to SVC for common stack
|
||||
cps #0x13 ; Switch to SVC for common stack
|
||||
stmfd SP!,{LR} ; Store the link register for the current mode
|
||||
sub SP,SP,#0x20 ; Save space for SP, LR, PC, IFAR - CPSR
|
||||
stmfd SP!,{R0-R12} ; Store the register state
|
||||
|
||||
mov R0,#6
|
||||
mov R0,#6 ; ExceptionType
|
||||
ldr R1,CommonExceptionEntry
|
||||
bx R1
|
||||
|
||||
FiqEntry
|
||||
sub LR,LR,#4
|
||||
srsfd #0x13! ; Store return state on SVC stack
|
||||
cpsid if,#0x13 ; Switch to SVC for common stack
|
||||
cps #0x13 ; Switch to SVC for common stack
|
||||
stmfd SP!,{LR} ; Store the link register for the current mode
|
||||
sub SP,SP,#0x20 ; Save space for SP, LR, PC, IFAR - CPSR
|
||||
stmfd SP!,{R0-R12} ; Store the register state
|
||||
|
||||
mov R0,#7
|
||||
; Since we have already switch to SVC R8_fiq - R12_fiq
|
||||
; never get used or saved
|
||||
mov R0,#7 ; ExceptionType
|
||||
ldr R1,CommonExceptionEntry
|
||||
bx R1
|
||||
|
||||
//
|
||||
// This gets patched by the C code that patches in the vector table
|
||||
//
|
||||
CommonExceptionEntry
|
||||
dcd 0x12345678
|
||||
|
||||
ExceptionHandlersEnd
|
||||
|
||||
//
|
||||
// This code runs from CpuDxe driver loaded address. It is patched into
|
||||
// CommonExceptionEntry.
|
||||
//
|
||||
AsmCommonExceptionEntry
|
||||
mrc p15, 0, R1, c6, c0, 2 ; Read IFAR
|
||||
str R1, [SP, #0x50] ; Store it in EFI_SYSTEM_CONTEXT_ARM.IFAR
|
||||
@@ -196,25 +210,50 @@ AsmCommonExceptionEntry
|
||||
ldr R1, [SP, #0x5c] ; srsfd saved pre-exception CPSR on the stack
|
||||
str R1, [SP, #0x40] ; Store it in EFI_SYSTEM_CONTEXT_ARM.CPSR
|
||||
|
||||
add R2, SP, #0x38 ; Make R2 point to EFI_SYSTEM_CONTEXT_ARM.LR
|
||||
and R1, R1, #0x1f ; Check CPSR to see if User or System Mode
|
||||
cmp R1, #0x1f ; if ((CPSR == 0x10) || (CPSR == 0x1df))
|
||||
cmpne R1, #0x10 ;
|
||||
stmeqed R2, {lr}^ ; save unbanked lr
|
||||
; else
|
||||
stmneed R2, {lr} ; save SVC lr
|
||||
|
||||
ldr R1, [SP, #0x58] ; PC is the LR pushed by srsfd
|
||||
str R1, [SP, #0x3c] ; Store it in EFI_SYSTEM_CONTEXT_ARM.PC
|
||||
str R1, [SP, #0x38] ; Store it in EFI_SYSTEM_CONTEXT_ARM.LR
|
||||
|
||||
sub R1, SP, #0x60 ; We pused 0x60 bytes on the stack
|
||||
str R1, [SP, #0x34] ; Store it in EFI_SYSTEM_CONTEXT_ARM.SP
|
||||
|
||||
; R0 is exception type
|
||||
mov R1,SP ; Prepare System Context pointer as an argument for the exception handler
|
||||
; R0 is ExceptionType
|
||||
mov R1,SP ; R1 is SystemContext
|
||||
|
||||
/*
|
||||
VOID
|
||||
EFIAPI
|
||||
CommonCExceptionHandler (
|
||||
IN EFI_EXCEPTION_TYPE ExceptionType, R0
|
||||
IN OUT EFI_SYSTEM_CONTEXT SystemContext R1
|
||||
)
|
||||
*/
|
||||
blx CommonCExceptionHandler ; Call exception handler
|
||||
|
||||
ldr R2,[SP,#0x40] ; EFI_SYSTEM_CONTEXT_ARM.CPSR
|
||||
str R2,[SP,#0x5c] ; Store it back to srsfd stack slot so it can be restored
|
||||
|
||||
ldr R2,[SP,#0x3c] ; EFI_SYSTEM_CONTEXT_ARM.PC
|
||||
str R2,[SP,#0x58] ; Store it back to srsfd stack slot so it can be restored
|
||||
ldr R1,[SP,#0x3c] ; EFI_SYSTEM_CONTEXT_ARM.PC
|
||||
str R1,[SP,#0x58] ; Store it back to srsfd stack slot so it can be restored
|
||||
|
||||
ldr R1,[SP,#0x40] ; EFI_SYSTEM_CONTEXT_ARM.CPSR
|
||||
str R1,[SP,#0x5c] ; Store it back to srsfd stack slot so it can be restored
|
||||
|
||||
add R3, SP, #0x54 ; Make R3 point to SVC LR saved on entry
|
||||
add R2, SP, #0x38 ; Make R2 point to EFI_SYSTEM_CONTEXT_ARM.LR
|
||||
and R1, R1, #0x1f ; Check to see if User or System Mode
|
||||
cmp R1, #0x1f ; if ((CPSR == 0x10) || (CPSR == 0x1df))
|
||||
cmpne R1, #0x10 ;
|
||||
ldmeqed R2, {lr}^ ; restore unbanked lr
|
||||
; else
|
||||
ldmneed R3, {lr} ; restore SVC lr, via ldmfd SP!, {LR}
|
||||
|
||||
ldmfd SP!,{R0-R12} ; Restore general purpose registers
|
||||
; Exception handler can not change SP or LR as we would blow chunks
|
||||
; Exception handler can not change SP
|
||||
|
||||
add SP,SP,#0x20 ; Clear out the remaining stack space
|
||||
ldmfd SP!,{LR} ; restore the link register for this context
|
||||
|
Reference in New Issue
Block a user